/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Drawing/PolyEditPreviewMesh.h
Update extrude-type preview mesh using external function. if bFullRecalculate, mesh is re-initialized w/ initial extrusion patch SourceMesh before calling function
void UpdateExtrudeType ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) &)> UpdateMeshFunc, bool bFullRecalculate )